Lead researcher Michel Lucas, a research fellow in the Department of Nutrition at the Harvard School of Public Health, and colleagues found the risk of suicide for adults who drank two to four cups of caffeinated coffee per day was about half that of those who drank decaffeinated coffee or very little or no coffee.

Interestingly, the association between coffee and a lower risk of death was similar whether the coffee drinker consumed caffeinated or decaffeinated coffee, suggesting that it isn't caffeine but other ingredients that produce the measured benefits.

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